Tie plate



Nov. 18 1924- J. LUNDIE TIE PLATE Filed June 2, 1923 INVENTOR Jo/uz L11 1nd! (2,

ATTORNEY Patented Nov; l8, 1 924.

stares i,5i6,t5t caries.

JOHN LUNDIE, OF NEW YORK, N. Y.

111E PLATE.

Application file'd J'une 2, 1923. Serial No. 643,005.

To all whom it may concern.-

Be' it known that I, JOHN LUNDIE, a citizen of the United States, residing at New York, New York, have invented certain. new and useful Improvements in Tie; Plates, of which the following is a specificatio'n'.

The present invention relates to railway tie-plates, of the type shown in my Reissue @Letters Patent No. 14,124, dated May 2nd, '10

1916. The plate of the present invention is an improvement over that type of plate inthat while it is slightly resilient when under load and has upper and lower curved surfaces to provide a convex top and a concave bottom, the curvature of the middle. portion of its upper surface is preferably on a given .erence to the accompanying drawings, illustrating one embodiment thereof, and in which-- Fig. 1 is a dotted lines;

Fig. 2 is an edge view with the top of the plan, parts being indicated by bottom concavity indicated by dotted linesr and' Fig. 3 is a transverse section.

Referring to the drawings, the body 10 of the plate has a rail-abutting shoulder 11 and ribs or steps 12. The plate is composed of metal such as steel, forexample. and is so 1forned as to act resiliently under a train ca I The bottom of the plate is curved, preferably on a radius of about ten feet, so as t make it somewhat resilient and to form a slight concavity 13 which extends from one side edge to the other side edge of the plate,

which are those side edges that extend transversely of the-tie on-which the, plate ,is to I ultimately seat, and the ribs or steps 12 depend from that concavity, and "are prefer ably small enough so that they will notcut or damage the tie, but will yet'tend to wear a seat for the concaved bottom without injuring the fibres of the tie and sufficiently act to hold the plate seated on the tie.

The middle portion 14 of the top surfttce of the plate is curved transversely of the plate so as to provide a convexity, and the curvature is preferably on the same radius as the curvature of the bottom of the plate. The curvature 14 affords sufficient bearing for the rail to rest and rock on when a train passes over the rail.

Theopposite surfaces of the edge portions 15 of the plate, at both sides of the curvature 14, converge away therefrom to save unnecessary metal, and thus to lighten the plate, While retaining and not impairing its efficiency. The arcs of curvature extend transverse of the tie on which the plate is to ultimately seat. Preferably, the whole top surface of the plate is curved convexly in such way that the curvature is held, at the radiusof the bottom curvature, through a great portion of its length, as.at 14, while the ends of said top curvature are of decreased radius, as at 16, so that if, for example, the plate has a. curve of a ten foot radius at 14, the radius at 16 would be less, say six feet. In effect the general inclination of the surfaces at i6 is greater than the intermediate surface at 14. v

Consequently, under the present invention tie-plates having the same specifications for the metal as the other type mentioned and of corresponding size may be made cheaper and 'of less weight, Without impairing their efficiency.

It is obvious that slight changes may be made in the tie-plate shown and described without departing from the spirit and scope of the invention as claimed.

What I .claim as new is:

1. A tie plate, which is free from he penetratingor splitting parts, and has upwardly but slightly curved top and bottom surfaces extending from edge to edge of the plate,

the curvature extending in an arc transverse of the tie on which the plate 1s to ultimately seat, the top curvature being held through the greater portion of its length, each end of the curve of the said top surface being on a less radius than the intermediate portion of that curve and the bottom curyature being maintained on a given radius from edge to edge of the plate.

2. A tie plate having upwardly curved top and bottom surfaces, the curvature of both of the surfaces being approximately on a ten foot radius and extending in arcs transverse of the tie onwhich the plate is to ultimately seat, except thatthe upward top curvature is on a decreased rediuset the edqe portions of the plate which are at the en s of said arcs. I

3. A tie plate having a bottom which is ooncavely curved from ed e to edge of the plate and a top with its middle portion convexly curved to the same degree as the bottorn both curvatures extending in ares transverse of the tie on which the plate is to ultimately seat, and the opposite surfaces of the edge portions of the plate which are at the ends of said arcs converging away from said middle portion.

at. A tie plete, whih is slightly curved on its under-face and at the middle of its uppentaee so as to provide a convex top each being on a radius of approximately ten feet and extending in ares transverse of the tie on which the plate is to ultimetely seat, and the opposite surfaces tions of the plate which are at the ends of of the edge porsaid arcs converging away from said middle top curvature, the bottom of said plate having siight oottom rihs which extend across end between said edge portions, and the plate being resilient from edge to edge under e trein loed end forming, throughout its bottom surface, its own seat on thefltie without injuring the fibres of the tie. 3

, JUHN LUNDIE 

